CN113518700A - Marble-color molded product and marble-color effect evaluation system - Google Patents

Marble-color molded product and marble-color effect evaluation system Download PDF

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Publication number
CN113518700A
CN113518700A CN202080016960.0A CN202080016960A CN113518700A CN 113518700 A CN113518700 A CN 113518700A CN 202080016960 A CN202080016960 A CN 202080016960A CN 113518700 A CN113518700 A CN 113518700A
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China
Prior art keywords
marble
pattern
molding
color effect
molded article
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Granted
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CN202080016960.0A
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Chinese (zh)
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CN113518700B (en
Inventor
韩正珍
李修京
裴成学
李栗
李龙珠
金亨奭
韩尚澈
文超禄
郭炳进
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LG Chem Ltd
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LG Chem Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N21/57—Measuring gloss
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
    • C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G—PHYSICS
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    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7616—Surface properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7629—Moulded articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76451—Measurement means
    • B29C2945/76461—Optical, e.g. laser
    • B29C2945/76464—Optical, e.g. laser cameras
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/006—PBT, i.e. polybutylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
    • B29K2105/0032—Pigments, colouring agents or opacifiyng agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/504—Goniometric colour measurements, for example measurements of metallic or flake based paints
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N2021/4704—Angular selective
    • G01N2021/4711—Multiangle measurement
    • G01N2021/4714—Continuous plural angles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N2021/4704—Angular selective
    • G01N2021/4711—Multiangle measurement
    • G01N2021/4723—Scanning scatter angles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N2021/4735—Solid samples, e.g. paper, glass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • G01N2021/4752—Geometry
    • G01N2021/4757—Geometry 0/45° or 45/0°
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N2021/555—Measuring total reflection power, i.e. scattering and specular
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N21/57—Measuring gloss
    • G01N2021/575—Photogoniometering

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  • Injection Moulding Of Plastics Or The Like (AREA)
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Abstract

An embodiment according to an aspect of the present invention provides a marble molding obtained by injection molding a mixture in a mold cavity, the mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, wherein a pattern forming texture is formed on a surface of the injection molded article. An embodiment according to another aspect of the present invention provides a system for evaluating marble color effects of marble moldings, which are injection-molded articles of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, the system comprising: a light source unit configured to emit light onto a surface of the molded article while forming an angle with the surface of the molded article; an image capturing unit configured to capture an image of light scattered from a surface of the molded article; an image processing unit configured to process the image captured by the image capturing unit to determine a boundary of an area establishing a marble color effect on a surface of the molded article; and an evaluation factor determination unit configured to determine a marble color effect evaluation factor from the image processed by the image processing unit.

Description

Marble-color molded product and marble-color effect evaluation system
Technical Field
The present invention claims the benefit of korean patent application No.10-2019-0121207, filed in the korean intellectual property office on 30/9/2019, the entire contents of which are incorporated herein by reference.
The present invention relates to a marble molding and a system for evaluating the color effect of marble.
Background
Engineering Plastics (EP) such as polycarbonate resin, Acrylonitrile Butadiene Styrene (ABS), and the like, which are thermoplastic resin plastics, are widely used as materials for IT household appliances, automobile parts, and the like due to their excellent mechanical and thermal properties.
In order to establish a pattern on the outside of the injection molded plastic article, a coating process such as spraying, coating, or plating is generally performed on the top surface of the injection molded plastic article. However, the coating process causes environmental problems due to the binder used in the process and Volatile Organic Compounds (VOCs) generated in the washing process. In addition, the coating process has problems in that a failure rate is increased therein since it is performed through a plurality of complicated steps, and in that considerable logistic costs are generated, such as separate expenses for the injection molding transportation of the plastic articles to the coating process and the packaging process.
Accordingly, there is an increasing demand for establishing a pattern on the outside of a plastic article without using a painting process, and research is actively conducted to establish a metallic appearance, an artificial marble pattern, and the like using pearls, metal particles, pigment particles, and the like. Among them, the artificial marble patterns are collectively called marble colors. To date, no system has been specifically proposed for efficiently forming a marble-colored mold pattern and for evaluating the effect of marble color.
Here, the expression "it can be seen that the marble color is effectively formed" means that even if the marble molding is viewed from various directions, the marble region can be clearly observed from all directions.
Meanwhile, marble molded articles formed without using a coating process generally tend to have lower surface hardness than molded articles formed with a coating layer using a coating process, and thus a mold pattern for increasing the surface hardness is also required.
The above background is technical information that the inventors of the present invention have possessed to produce embodiments of the present invention or is technical information that has been obtained in the course of producing embodiments of the present invention, and is not necessarily regarded as a publicly known technique that is open to the public prior to application of the embodiments of the present invention.
Disclosure of Invention
Technical problem
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a marble molding that can efficiently form marble color and can maintain high surface hardness, and a marble color effect evaluation system as a system for evaluating a marble color effect of a surface of the marble molding.
However, the object to be solved by the present invention is not limited to the above object, and other objects not mentioned herein will be clearly understood from the following description by those skilled in the art.
Technical scheme
An embodiment of the present invention provides a marble molding which is an injection-molded article of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, wherein a pattern forming texture is formed on a surface of the injection molded article.
According to an embodiment of the present invention, the depth of the pattern formed on the surface of the molded article may be 100nm to 1,000 μm.
According to an embodiment of the present invention, the surface of the molded article on which the pattern is formed may have an average roughness (Ra) of 1.12 μm to 12.5 μm.
According to an embodiment of the present invention, the pattern may have a depth of 10 to 50 μm and a width of 50 to 300 μm, and the texture formed by the pattern may be a hair line texture.
According to an embodiment of the present invention, the pattern may have a depth of 8 to 12 μm and a width of 50 to 100 μm, and the texture formed by the pattern may be a woven texture.
According to an embodiment of the present invention, the depth of the pattern may be 50 μm to 100 μm, and the texture formed by the pattern may be a leather texture.
Another embodiment of the present invention provides a system for evaluating marble color effects of marble molded articles, which are injection molded articles of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, the system comprising: a light source unit configured to emit light onto a surface of the molded article while forming an angle with the surface of the molded article; an image capturing unit configured to capture an image of light scattered from a surface of the molded article; an image processing unit configured to process the image captured by the image capturing unit to determine a boundary of an area in which a marble color effect is established on the surface of the molded article; and an evaluation factor determination unit configured to determine a marble color effect evaluation factor from the image processed by the image processing unit, wherein the marble color effect evaluation factor is at least one of: establishing a number of regions of the marble color effect; establishing a size of the area of the marble color effect; and a difference in average color brightness between a region where the marble color effect is established and a region where the marble color effect is not established.
According to an embodiment of the present invention, the evaluation factor determination unit may determine a marble color effect evaluation factor for each color within an area where the marble color effect is established.
Advantageous effects
The marble molding according to one embodiment of the present invention may be a marble molding that may effectively form a marble color and may maintain high surface hardness.
The system for evaluating marble color effect according to one embodiment of the present invention can quantitatively evaluate the marble color effect of the surface of the marble molding by determining an evaluation factor that can quantitatively determine the marble color effect.
Effects of the present invention are not limited to the above-described effects, and effects not mentioned herein will be clearly understood from the present specification and the accompanying drawings by those skilled in the art.
Drawings
Fig. 1 shows a captured image of an example of a marble molding prepared using an embodiment of a cavity having a hairline texture pattern, and a magnified microscopic image of the surface of the marble molding.
Fig. 2 shows a captured image of an example of a marble molding prepared using an embodiment of a cavity having a woven texture pattern, and a magnified microscope image of the surface of the marble molding.
Fig. 3 shows a captured image of an example of a marble molding prepared using an embodiment of a cavity having a leather grain pattern, and a magnified microscope image of the surface of the marble molding.
Fig. 4 is a schematic view illustrating a marble color effect evaluation system according to an embodiment of the present invention.
Fig. 5(a) illustrates an embodiment of an image before being processed by the image processing unit, and fig. 5(b) illustrates an image obtained by processing the image of fig. 5(a) by the image processing unit according to a predetermined reference.
Fig. 6(a), (b), (c), (d), and (e) show images of samples of comparative example 1, comparative example 2, example 1, example 2, and example 3, respectively, captured by the image capturing unit 20 of the marble color effect evaluation system 100 according to one embodiment of the present invention.
Detailed Description
The present invention will become apparent by reference to the embodiments and drawings described in detail below. However, the present invention is not limited to the embodiments disclosed below, and may be embodied in various different forms. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art, and the scope of the invention will be defined only by the appended claims. Meanwhile, the terms used in the present specification are used to explain the embodiments, and are not intended to limit the scope of the present invention. In this specification, the singular forms also include the plural forms unless specifically stated otherwise in context. As used in the specification, the terms "comprises" and/or "comprising" specify the presence of stated elements, steps, operations, and/or components, but do not preclude the presence or addition of one or more other elements, steps, operations, and/or components. Although terms such as "first" and "second" may be used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another component.
Throughout this specification, it should be understood that when any component is referred to as "comprising" any component, it does not exclude other components, but may further comprise other components, unless otherwise specified.
Throughout this specification, when any member is referred to as being "on" another member, it refers not only to the case where any member is in contact with another member, but also to the case where a third member is present between the two members.
Throughout this specification, "a and/or B" means "a and B" or "a or B".
Hereinafter, the present invention will be described in more detail.
An embodiment of the present invention provides a marble molding which is an injection-molded article of a mixture comprising: a thermoplastic resin comprising at least one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, wherein a pattern forming texture is formed on a surface of the injection molded article.
The marble molding according to one embodiment of the present invention may be a marble molding that may effectively form a marble color and may maintain high surface hardness.
According to one embodiment of the present invention, the marble molding comprises a thermoplastic resin including one selected from the group consisting of polycarbonate, acrylonitrile-butadiene-styrene, polybutylene terephthalate, polypropylene, and combinations thereof. Specifically, the thermoplastic resin may be a resin containing only any one of Polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate (PBT) and polypropylene (PP), or may contain one selected from Polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS), polybutylene terephthalate (PBT), polypropylene (PP) and a combination thereof. By selecting the material of the thermoplastic resin from the above-mentioned substances, the compatibility of the thermoplastic resin with the fine pigment particles can be improved, while the processability thereof in the injection molding process is improved.
According to one embodiment of the present invention, the marble molding comprises fine pigment particles. In the case where the marble molding contains fine pigment particles as described above, the marble color effect on the surface of the marble molding can be improved. In the present specification, the marble color effect may refer to a marble shape and/or form established by exposing fine pigment particles onto the surface of a thermoplastic resin, and the marble may be an artificial marble.
According to an embodiment of the present invention, the fine pigment particles may have a size of 25 μm to 2,000 μm, 50 μm to 1,900 μm, 100 μm to 1,800 μm, 200 μm to 1,700 μm, 300 μm to 1,600 μm, 400 μm to 1,500 μm, 500 μm to 1,400 μm, 600 μm to 1,300 μm, 700 μm to 1,200 μm, 800 μm to 1,100 μm, or 900 μm to 1,000 μm. By adjusting the size of the fine pigment particles within the above range, the visibility of the fine pigment particles can be improved.
According to one embodiment of the present invention, the fine pigment particles may be used as they are without coating a separate dye. When the fine pigment particles are used as they are without coating a separate dye as described above, the marble color may be established as the inherent color of the fine pigment particles.
According to one embodiment of the present invention, the fine pigment particles may be coated with an organic dye and/or an inorganic dye. By coating the fine pigment particles with the organic dye and/or the inorganic dye as described above, it is possible to establish the marble color as a color different from the inherent color of the fine pigment particles, and at the same time, to impart the physical properties of the fine pigment particles to the marble molding and to improve the compatibility between the thermoplastic resin and the fine pigment particles.
According to an embodiment of the present invention, the shape of the fine pigment particles may be one selected from the group consisting of plate-like, cylindrical (columnar), plate-like, and combinations thereof. By selecting the shape of the fine pigment particles from the shapes as described above, the marble color effect of the marble molding can be improved.
According to an embodiment of the present invention, the fine pigment particles may include one selected from the group consisting of platy mica, cellulose, viscose, aluminum (Al), pearl, and a combination thereof. The marble color effect of the marble molding can be improved by selecting fine pigment particles from the above-mentioned substances.
According to one embodiment of the present invention, the marble molding is an injection molded article comprising a mixture of the thermoplastic resin and the fine pigment particles. Specifically, the marble molding is a molding prepared by heating and melting a mixture containing the thermoplastic resin and fine pigment particles, and then injecting the melt into a mold cavity. On the other hand, the marble molded article may be a molded article prepared by injecting an extruded product containing the thermoplastic resin and the fine pigment particles into a mold cavity. In the case of preparing a marble molding using the mixture injection-molded article comprising the thermoplastic resin and fine pigment particles as described above, it is possible to simplify the preparation process of the marble molding and mass-prepare the marble molding by shortening the preparation time of the marble molding.
According to one embodiment of the present invention, the marble molding may be an injection molded article having a pattern forming texture on a surface thereof. More specifically, the texture established on the surface of the injection molded article may be a hair texture, a woven texture, or a leather texture. Further, the surface of the molded article may refer to a portion exposed to the outside, i.e., a surface of the molded article contacting the air, and may refer to the entire surface or a partial surface of the molded article. In the case of providing the texture-forming pattern on the surface of the injection molded article as described above, it is possible to improve the aesthetic properties of the marble molded article, eliminating the need for a separate paint or coating on the surface of the molded article, thereby preventing the paint or coating on the surface of the molded article from peeling off.
Further, in the case where the surface of the molded article is smooth (no pattern is formed on the surface) marble molded article, the visibility of marble color may vary greatly according to the direction of the observation surface. This is because the size, density, color brightness, etc. of the fine pigment particles distributed on the surface of the marble molding thus prepared are not uniform throughout the entire area, and thus, the variation in the degree of diffuse reflection of light incident on the surface of the marble molding may be different according to the direction of the observation surface. Therefore, in the case where the pattern forming the texture is provided on the surface of the marble molding, even in the case where the size, density, color brightness, etc. of the fine pigment particles distributed on the surface of the marble molding are not completely uniform over the entire area, the variation in the degree of diffuse reflection of light incident on the surface of the marble molding can be reduced by the transferred pattern so as to be relatively uniformly distributed on the corresponding surface, and the variation in the visibility of the marble color according to the direction of observing the surface can also be reduced.
According to an embodiment of the present invention, the width and/or depth of the pattern formed on the surface of the molded article may be 0.1nm to 1,000 μm. Specifically, the width and/or depth of the pattern formed on the surface of the molded article may be 1nm to 900 μm, 10nm to 800 μm, 100nm to 500 μm, 500nm to 300 μm, 800nm to 200 μm, 1 μm to 100 μm, 10 μm to 90 μm, 20 μm to 80 μm, or 30 μm to 50 μm. More specifically, the pattern formed on the surface of the molded article may have a depth and/or width on the order of nanometers to micrometers. That is, the depth and/or width of the pattern may be determined within a range that can improve the visibility of marble color and/or surface hardness to a desired level according to the type, shape and size of the fine pigment particles. In the case where the width and/or depth of the pattern formed on the surface of the molded article is adjusted within the above-described ranges, the visibility of the fine pigment particles exposed on the pattern may be improved.
According to an embodiment of the present invention, the surface of the molded article on which the pattern is formed may have an average roughness (Ra) of 1.12 μm to 12.5 μm. Specifically, the average roughness (Ra) of the surface of the molded article on which the pattern is formed may be 1 μm to 15 μm, 2 μm to 14 μm, 3 μm to 13 μm, 4 μm to 12 μm, 5 μm to 11 μm, 6 μm to 10 μm, or 7 μm to 9 μm. In the case where the average roughness (Ra) of the surface of the molded article on which the pattern is formed is adjusted within the above range, it is possible to improve the marble color effect of the surface of the marble molded article and to improve the visibility of the fine pigment particles.
Fig. 1 shows a captured image of an example of a marble molding prepared using an embodiment of a cavity having a hair grain pattern and a magnified microscope image of the surface of the marble molding.
According to an embodiment of the present invention, when the texture formed by the pattern is a hair texture, the depth of the pattern may be 10 μm to 50 μm. Specifically, when the texture formed by the pattern is a hair line texture, the depth of the pattern may be 12 to 48 μm, 14 to 46 μm, 16 to 44 μm, 18 to 42 μm, 20 to 40 μm, 22 to 38 μm, 24 to 36 μm, 26 to 34 μm, or 28 to 32 μm. In addition, when the texture formed by the pattern is a hair texture, the width of the pattern may be 50 to 300 μm. Specifically, when the texture formed by the pattern is a hair texture, the width of the pattern may be 50 to 300 μm, 75 to 275 μm, 100 to 250 μm, 125 to 225 μm, or 150 to 200 μm. In the case where the width and/or depth of the pattern is adjusted within the above-described range when the texture formed by the pattern is a hairline texture, the portion of the fine pigment particles exposed on the pattern formed on the surface of the marble molding may be enlarged, and the hardness of the surface may be increased by improving compatibility with the marble molding.
Fig. 2 shows a captured image of an example of a marble molding prepared using an embodiment of a mold cavity having a woven texture pattern, and a magnified microscope image of the surface of the marble molding.
According to an embodiment of the present invention, when the texture formed by the pattern is a woven texture, the depth of the pattern may be 8 μm to 12 μm. Specifically, when the texture formed by the pattern is a woven texture, the depth of the pattern may be 8 μm to 12 μm, 8.5 μm to 11.5 μm, 9 μm to 11 μm, or 9.5 μm to 10.5 μm. In addition, when the texture formed by the pattern is a woven texture, the width of the pattern may be 50 μm to 100 μm. Specifically, when the texture formed by the pattern is a woven texture, the width of the pattern may be 55 to 95 μm, 60 to 90 μm, 65 to 85 μm, or 70 to 80 μm. In the case where the width and/or depth of the pattern is adjusted within the above-described range when the texture formed by the pattern is a woven texture, visibility may be improved by enlarging a portion of the fine pigment particles exposed on the pattern formed on the surface of the marble molding, and surface hardness may be improved by improving compatibility with the marble molding.
Fig. 3 shows a captured image of an example of a marble molding prepared using an embodiment of a cavity having a leather grain pattern, and a magnified microscope image of the surface of the marble molding.
According to an embodiment of the present invention, when the texture formed by the pattern is a leather texture, the depth of the pattern may be 50 μm to 100 μm. Specifically, when the texture formed by the pattern is a leather texture, the depth of the pattern may be 55 to 95 μm, 60 to 90 μm, 65 to 85 μm, or 70 to 80 μm. In the case where the depth of the pattern is adjusted within the above range when the texture formed by the pattern is a leather texture, visibility can be improved by enlarging a portion where fine pigment particles are exposed on the pattern formed on the surface of the marble molding, and surface hardness can be improved by improving compatibility with the marble molding.
One embodiment of the present invention provides a mold for preparing a marble molding, on the inner surface of the cavity of which a pattern is formed. The mold for manufacturing marble moldings according to one embodiment of the present invention may effectively form marble colors and may increase the surface hardness of the marble moldings.
According to an embodiment of the present invention, a mixture including a thermoplastic resin including one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and a combination thereof and fine pigment particles may be injected into the inside of a cavity of a mold and filled, and then molded. According to another embodiment of the present invention, the extruded product including the thermoplastic resin and the fine pigment particles may be injected into a cavity of a mold. In the case where a molded article is prepared by injecting a melt of the mixture into the cavity of a mold, a molded article in which a marble color effect has been established can be prepared, and the molded article can be mass-produced by shortening the preparation time.
In this specification, description of the features of the mold overlapping with the marble molding will be omitted.
According to one embodiment of the present invention, a pattern may be formed on an inner surface of a cavity of a mold. In the case where the pattern is formed on the inner surface of the cavity of the mold as described above, the marble color effect may be improved by transferring the pattern formed on the inner surface of the cavity of the mold to the surface of the molded article. In particular, in the case of a marble molded article obtained by injection molding with a cavity having a smooth inner surface, the visibility of marble color may vary greatly depending on the direction of the observation surface. This is because the size, density, color brightness, etc. of the fine pigment particles distributed on the surface of the marble molding thus prepared are completely non-uniform over the entire area, and thus, the degree of diffuse reflection of light incident on the surface of the marble molding may be different depending on the change in the direction of the observation surface.
According to one embodiment of the present invention, a textured pattern may be formed on the interior surface of the mold cavity. In the case of transferring the pattern onto the surface of the marble molding, even in the case where the average size, density, color brightness, etc. of the fine pigment particles distributed on the surface of the marble molding are completely non-uniform over the entire area, the variation in the degree of diffuse reflection of light incident on the surface of the marble molding can be reduced by the transferred pattern so as to be relatively uniformly distributed on the corresponding surface, and the variation in the visibility of the marble molding according to the direction of the observation surface can also be reduced.
According to an embodiment of the present invention, the width and/or depth of the pattern formed on the inner surface of the mold cavity may be 100nm to 1,000 μm. Specifically, the width and/or depth of the pattern formed on the inner surface of the cavity may be 150nm to 900 μm, 300nm to 800 μm, 500nm to 500 μm, 800nm to 300 μm, 900nm to 200 μm, 1 μm to 100 μm, 10 μm to 90 μm, 20 μm to 80 μm, or 30 μm to 50 μm. In particular, the width and/or depth of the pattern formed on the inner surface of the mold cavity may be a depth and/or width on the order of nanometers to micrometers. The width and/or depth of the pattern formed on the inner surface of the cavity may be determined within a range that can improve the visibility of marble color and/or surface hardness to a desired level according to the type, shape and size of the fine pigment particles. In the case where the width and/or depth of the pattern formed on the inner surface of the cavity is adjusted within the above-described range, the width and/or depth of the pattern formed on the marble molding may be adjusted and the visibility of the fine pigment particles may be improved by transferring the pattern onto the inner surface of the cavity.
According to an embodiment of the present invention, the inner surface of the mold cavity on which the pattern is formed may have an average roughness (Ra) of 1.12 μm to 12.5 μm. More specifically, the average roughness (Ra) of the inner surface of the cavity on which the pattern is formed may be 1 to 15 μm, 2 to 14 μm, 3 to 13 μm, 4 to 12 μm, 5 to 11 μm, 6 to 10 μm, or 7 to 9 μm. In the case where the average roughness of the inner surface of the cavity on which the pattern is formed is adjusted to be within the above range, it is possible to improve the marble color effect of the surface of the marble molded article and to improve the visibility of the fine pigment particles by transferring the pattern.
According to an embodiment of the present invention, when the texture of the inner surface of the cavity on which the pattern is formed is a hair texture, the depth of the pattern may be 10 μm to 50 μm. Specifically, when the texture of the inner surface of the cavity on which the pattern is formed is a hair line texture, the depth of the pattern may be 12 μm to 48 μm, 14 μm to 46 μm, 16 μm to 44 μm, 18 μm to 42 μm, 20 μm to 40 μm, 22 μm to 38 μm, 24 μm to 36 μm, 26 μm to 34 μm, or 28 μm to 32 μm. Further, when the texture of the inner surface of the cavity on which the pattern is formed is a hair texture, the width of the pattern may be 50 μm to 300 μm. Specifically, when the texture of the inner surface of the cavity on which the pattern is formed is a hair texture, the width of the pattern may be 50 μm to 300 μm, 75 μm to 275 μm, 100 μm to 250 μm, 125 μm to 225 μm, or 150 μm to 200 μm. In the case where the width and/or depth of the pattern is adjusted within the above-described range when the texture of the inner surface of the cavity on which the pattern is formed is a hairline texture, the portion of the fine pigment particles exposed on the pattern formed on the surface of the marble molding can be enlarged, and the surface hardness can be improved by improving compatibility with the marble molding.
According to an embodiment of the present invention, when the texture of the inner surface of the cavity on which the pattern is formed is a woven texture, the depth of the pattern may be 8 μm to 12 μm. Specifically, when the texture of the inner surface of the cavity on which the pattern is formed is a woven texture, the depth of the pattern may be 8 μm to 12 μm, 8.5 μm to 11.5 μm, 9 μm to 11 μm, or 9.5 μm to 10.5 μm. Further, when the texture of the inner surface of the cavity on which the pattern is formed is a woven texture, the width of the pattern may be 50 μm to 100 μm. Specifically, when the texture of the inner surface of the cavity on which the pattern is formed is a woven texture, the width of the pattern may be 55 μm to 95 μm, 60 μm to 90 μm, 65 μm to 85 μm, or 70 μm to 80 μm. In the case where the width and/or depth of the pattern is adjusted within the above-described range when the texture of the inner surface of the cavity on which the pattern is formed is a woven texture, visibility can be improved by enlarging the portion of the fine pigment particles exposed on the pattern formed on the surface of the marble molded article, and surface hardness can be improved by improving compatibility with the marble molded article.
According to an embodiment of the present invention, when the texture of the inner surface of the cavity on which the pattern is formed is leather texture, the depth of the pattern may be 50 μm to 100 μm. Specifically, when the texture of the inner surface of the cavity on which the pattern is formed is a leather texture, the depth of the pattern may be 55 to 95 μm, 60 to 90 μm, 65 to 85 μm, or 70 to 80 μm. In the case where the depth of the pattern is adjusted to be within the above range when the texture of the inner surface of the cavity on which the pattern is formed is a leather texture, visibility can be improved by enlarging the portion of the fine pigment particles exposed on the pattern formed on the surface of the marble molded article, and surface hardness can be improved by improving compatibility with the marble molded article.
One embodiment of the present invention relates to a method for preparing a marble molding, wherein the marble molding may be prepared by injecting an extruded product of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles. In another embodiment, a marble molding may be prepared by injecting into a mold cavity a melt of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles.
The method of manufacturing a marble molding according to one embodiment of the present invention may be a method of manufacturing a marble molding that can efficiently form a marble color and can maintain high surface hardness.
In the present specification, description of the features of the method for preparing the marble molding overlapped with the marble molding will be omitted.
According to an embodiment of the present invention, the temperature of the injection molding process may be 230 ℃ to 320 ℃. Specifically, the temperature of the injection molding process may be 240 ℃ to 310 ℃, 250 ℃ to 300 ℃, 260 ℃ to 290 ℃, or 270 ℃ to 280 ℃. By adjusting the temperature of the injection molding process within the above range, the fillability of the mold cavity can be improved by adjusting the viscosity of the melt of the mixture during the injection molding process.
According to an embodiment of the present invention, a mixture including the thermoplastic resin and the fine pigment particles may be injection molded. Specifically, a melt formed by heating and melting the mixture containing the thermoplastic resin and the fine pigment particles may be injection-molded in a mold cavity. In the case where the mixture containing the thermoplastic resin and the fine pigment particles is injection-molded as described above, a molded article to which the pattern provided on the inner surface of the cavity has been transferred can be produced. More specifically, the molded article prepared by the above preparation method may have an artificial marble pattern, i.e., a marble color.
According to an embodiment of the present invention, an extruded product formed by mixing the thermoplastic resin with the fine pigment particles may be injection-molded in a mold cavity. In the case where an extruded product formed by mixing a thermoplastic resin with fine pigment particles is injection-molded in a cavity, a molded article having an artificial marble pattern can be prepared.
One embodiment of the present invention provides a system 100 for evaluating marble color effects of marble molded articles, the marble molded articles being injection molded articles of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, the system comprising: a light source unit 10 configured to emit light onto a surface of the molded article while forming an angle with the surface of the molded article; an image capturing unit 20 configured to capture an image of light scattered from the surface of the molded article; an image processing unit 30 configured to process the image captured by the image capturing unit to determine a boundary of an area establishing a marble color effect on a surface of the molded article; and an evaluation factor determination unit 40 configured to determine a marble color effect evaluation factor from the image processed by the image processing unit 30; wherein the marble color effect evaluation factor is at least one of the following: establishing a number of regions of the marble color effect; establishing an average size of the area of the marble color effect; and a difference in average color brightness between a region where the marble color effect is established and a region where the marble color effect is not established.
The marble color effect evaluation system according to one embodiment of the present invention may quantitatively evaluate the marble color effect of the surface of the marble molding by determining an evaluation factor that may quantitatively determine the marble color effect.
According to an embodiment of the present invention, the marble molding to be evaluated in the marble color effect evaluation system may be a molding prepared by injection molding using a mold cavity having a smooth inner surface, or may be a molding prepared by injection molding using a mold cavity having a pattern formed on an inner surface thereof. In the case where the pattern on the inner surface of the marble molded article to be evaluated is selected as described above, the marble color effect can be quantitatively evaluated.
Fig. 4 is a schematic view showing a marble color effect evaluation system according to an embodiment of the present invention.
According to an embodiment of the present invention, the marble color effect evaluation system 100 may include a light source unit 10, an image capturing unit 20, an image processing unit 30, and an evaluation factor determining unit 40.
According to one embodiment of the present invention, the light source unit 10 emits light onto the surface of the marble molding P at a predetermined angle. Specifically, the light source unit 10 emits light onto the surface of the marble molding while forming an angle with the surface of the marble molding P. In the case where the light source unit 10 emits light onto the surface of the marble molding P while forming an angle with the surface of the marble molding P as described above, an image in which the marble color effect can be confirmed can be created.
According to one embodiment of the present invention, the image capturing unit 20 captures an image of light scattered from the surface of the molded article. Specifically, the image capturing unit 20 may capture an image of light scattered from the surface of the marble molding P. This image capturing unit 20 may be a CCD camera. In the case where the image capturing unit 20 captures an image of scattered light as described above, an image of light of particles establishing a marble color effect may be captured.
According to an embodiment of the present invention, an image capturing unit 20 may be provided so that it can capture an image of light while moving along a virtual semicircular path of one side of the marble molding P. In the case where one image capturing unit 20 is provided such that it captures an image of light while moving along a virtual semicircular path on one side of the marble molding P as described above, it is possible to reduce the manufacturing cost for constructing the marble color effect evaluation system and minimize the difference in images due to the difference between two or more image capturing units.
According to one embodiment of the present invention, a plurality of image capture units 20 are arranged along a virtual semicircular path so that they can all operate to capture an image of light. In the case where the plurality of image capturing units 20 are arranged along the virtual semicircular path as described above so that they can all operate to capture an image of light as described above, the surfaces of a large number of molded articles can be evaluated by shortening the image capturing time.
According to one embodiment of the present invention, the marble color effect evaluation system includes an image processing unit 30 configured to process images captured by the image capturing unit 20 to determine the boundaries of the area establishing the marble color effect on the surface of the molded article. Specifically, the image processing unit 30 may process the image to determine the boundary of the marble color region of the image captured by the image capturing unit 20, and may be implemented as a predetermined processor. In the case where the marble color effect evaluation system includes the image processing unit as described above, the boundary of the region where the marble color effect is established can be clearly determined, and the regions where the marble color effect is not established can be quantitatively compared.
According to an embodiment of the present invention, the image processing unit 30 may determine each pixel having a value equal to or greater than a predetermined reference value as a boundary pixel forming a boundary of the region in which the marble color effect is established by extracting a contrast value of each pixel from the captured image, and connect the boundary pixels to determine the boundary of the region in which the marble color effect is established. In the case where the boundary of the region where the marble color effect is established is determined as described above, the captured original image may be processed to make the boundary clearly visible.
According to an embodiment of the present invention, the reference contrast value for determining the boundary of the region where the marble color effect is established may be different according to each color set previously. In the case where the image processing unit 30 sets different reference values for each of the marble colors as described above, the captured image may be processed to make the boundary of the region where the marble color effect is established clearly visible.
Fig. 5(a) shows an example of an image before being processed by the image processing unit, and fig. 5(b) shows an image obtained by processing the image of fig. 5(a) by the image processing unit according to a predetermined reference.
For the marble molded article as an object of the image of fig. 5, mica was used as fine pigment particles, and the average roughness (Ra) of the inner surface of the cavity on which the pattern was formed was 1.12 μm. Marble molded articles prepared under these conditions were used as a reference.
Referring to fig. 5, in the image of fig. 5(a) before being processed by the image processing unit, it is confirmed that the boundary of the region where the marble color effect is established is not clear. In contrast, in the image of fig. 5(b) obtained by processing the image of fig. 5(a) by the image processing unit, it is confirmed that the boundary of the region where the marble color effect is established is clearly visible.
According to an embodiment of the present invention, the marble color effect evaluation system includes an evaluation factor determination unit 40 for determining a marble color effect evaluation factor from the image processed by the image processing unit. By including the evaluation factor determination unit as described above, the boundary of the region where the marble color effect is established can be clearly distinguished.
According to one embodiment of the present invention, the marble color effect evaluation factor is at least one of: establishing the number of regions of marble color effect; establishing an average size of the area of marble color effect; and a difference in average color brightness between the region where the marble color effect is established and the region where the marble color effect is not established. By selecting the marble color effect evaluation factor from the above factors, the boundary of the region where the marble color effect is established can be clearly distinguished. Specifically, the evaluation factor determination unit 40 may determine at least one of the number of areas in which a marble color effect is established (marble areas), the average size of the marble areas, and the difference in average color brightness between the marble areas and the background excluding the areas in which the marble color effect is established (non-marble areas) as the marble color effect evaluation factor from the image processed by the image processing unit 30, and the determination of the marble color effect evaluation factor may be performed by a predetermined processor.
According to an embodiment of the present invention, the evaluation factor determination unit may determine a marble color effect evaluation factor for each color within the area where the marble color effect is established. By determining the marble color effect evaluation factor as described above, the effect of clearly distinguishing the boundaries of the regions where the marble color effect is established can be improved.
Hereinafter, the present invention will be described in detail with reference to examples. However, the embodiments according to the present invention may be modified into various forms, and the scope of the present invention is not to be construed as being limited to the embodiments described below. The embodiments of the present specification are provided to more fully describe the present invention to those skilled in the art.
Example 1
A mixture obtained by mixing a thermoplastic resin consisting of a mixture of Polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) with mica as fine pigment particles is injection-molded in a cavity having a pattern formed on the inner surface thereof, thereby preparing a marble molding as an injection-molded article. The marble molding was prepared by injection molding in a mold having an average roughness (Ra) of the inner surface of the cavity, on which the pattern was formed, of 1.12 μm.
Example 2
A marble molding was prepared in the same manner as in example 1, except that it was prepared by injection molding in a mold having an average roughness (Ra) of the inner surface of the cavity, on which the pattern was formed, of 3.15 μm.
Example 3
A marble molding was prepared in the same manner as in example 1, except that it was prepared by injection molding in a mold having an average roughness (Ra) of the inner surface of the cavity, on which the pattern was formed, of 6.30 μm.
Comparative example 1
A mixture obtained by mixing a thermoplastic resin consisting of a mixture of Polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) with mica as fine pigment particles was injection-molded in a mold having an average roughness (Ra) of the inner surface of the cavity of 100nm, to prepare a molded article.
Comparative example 2
A marble molding was prepared in the same manner as in example 1, except that it was prepared by injection molding in a mold having an average roughness (Ra) of the inner surface of the cavity, on which the pattern was formed, of 12.6 μm.
Fig. 6(a), (b), (c), (d), and (e) show images of samples of comparative example 1, comparative example 2, example 1, example 2, and example 3, respectively, captured by the image capturing unit 20 of the marble color effect evaluation system 100 according to one embodiment of the present invention.
Specifically, light generated from the light source unit 10 is incident on the surface of each of the marble moldings of comparative examples 1 and 2 and examples 1 to 3 while forming an angle with the surface. Subsequently, an image of the light scattered from the surface of each molded article is captured by the image capturing unit 20. The image captured by the image capturing unit 20 is processed by the image processing unit 30 to determine the boundary of the marble region on the surface of each molded article. From the processed image, the marble color effect evaluation factors including the number of marble areas, the average size of the marble areas, and the average color brightness difference between the marble areas and the non-marble areas are determined by the evaluation factor determination unit 40.
For the molded articles of comparative examples 1 and 2 and examples 1 to 3, the following table 1 shows the number of marble areas, the number of marble areas per unit area, the average size of the marble areas, the difference in average color brightness between the marble areas and the background (non-marble areas) excluding the marble areas, and the pencil hardness of the surface.
Specifically, for the samples of the molded articles of comparative examples 1 and 2 and examples 1 to 3, the following table 1 shows the number of marble areas, the number of marble areas per unit area, the average size of the marble areas, the difference in average color brightness between the marble areas and the background excluding the marble areas (the difference in average color brightness between the marble areas and the non-marble areas), and the pencil hardness of the surface.
[ Table 1]
Figure BDA0003231159230000161
Figure BDA0003231159230000171
It was confirmed that in the case of the marble molded articles of the examples, the number of marble areas determined per unit area, and the difference in average color brightness between the marble areas and the non-marble areas were all improved, suggesting that the marble color effect was more effectively visible.
In contrast, it was confirmed that in the case of the marble molded article of comparative example 1, the hardness was excessively low, the number of marble regions determined per unit area and the difference in average color brightness between the marble regions and the non-marble regions were all decreased. Further, it was confirmed that in the case of comparative example 2, the number of determined marble regions per unit area was decreased.
Further, it was confirmed that the surface of the marble-molded article of the example had a pencil hardness higher than that of comparative example 1. That is, it was confirmed that the durability of the marble molding prepared by the example of the present invention was secured so that the deterioration of the color effect of the marble was minimized. However, it was confirmed that in the case of comparative example 2, although the hardness was increased, the number of marble regions determined per unit area was decreased, and thus the marble color effect was decreased.
Further, confirming the marble color effect evaluation factors according to the comparative examples and examples (in which the evaluation factor of the surface is determined by the marble color effect evaluation system), the number of marble areas per unit area, the average size of the marble areas, and the difference in average color brightness between the marble areas and the background excluding the marble areas can be determined, so that the marble color effect can be quantitatively evaluated.
Therefore, according to the marble molding and the marble color effect evaluation system of the present invention, it is possible to provide a marble molding that can efficiently form marble colors and can maintain high surface hardness, and to provide a marble color effect evaluation system that can objectively and quantitatively evaluate the marble color effect of the marble molding.
[ description of reference numerals ]
100: evaluation system
10: light source unit
20: image capturing unit
30: image processing unit
40: evaluation factor determination unit

Claims (8)

1. A marble molding which is an injection molded article of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and also the fine pigment particles, and the fine pigment particles,
wherein a pattern forming a texture is formed on a surface of the injection molded article.
2. The marble molding of claim 1, wherein the depth of the pattern formed on the surface of the molding is 100nm to 1,000 μm.
3. The marble molding as claimed in claim 1, wherein the surface of the molding on which the pattern is formed has an average roughness (Ra) of 1.12 to 12.5 μm.
4. The marble molding of claim 1, wherein the pattern has a depth of 10 to 50 μm and a width of 50 to 300 μm, and the texture formed by the pattern is a hair line texture.
5. The marble molding of claim 1, wherein the pattern has a depth of 8 to 12 μm and a width of 50 to 100 μm, and the texture formed by the pattern is a woven texture.
6. The marble molding as claimed in claim 1, wherein the depth of the pattern is 50 to 100 μm, and the texture formed by the pattern is a leather texture.
7. A system for evaluating marble color effects of marble molded articles, the marble molded articles being injection molded articles of a mixture comprising: a thermoplastic resin comprising one selected from the group consisting of polycarbonate, acrylonitrile butadiene styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, the system comprising:
a light source unit configured to emit light onto a surface of the molded article while forming an angle with the surface of the molded article;
an image capturing unit configured to capture an image of light scattered from a surface of the molded article;
an image processing unit configured to process the image captured by the image capturing unit to determine a boundary of an area establishing the marble color effect on the surface of the molded article; and
an evaluation factor determination unit configured to determine a marble color effect evaluation factor from the image processed by the image processing unit,
wherein the marble color effect evaluation factor is at least one of: establishing a number of regions of the marble color effect; establishing an average size of the area of the marble color effect; and a difference in average color brightness between a region where the marble color effect is established and a region where the marble color effect is not established.
8. The system according to claim 7, wherein the evaluation factor determination unit determines the marble color effect evaluation factor for each color within an area where the marble color effect is established.
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